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Coating solution for forming charge transport layer, electrophotographic photoreceptor prepared therewith and image forming apparatus comprising the same

A charge transport layer, electrophotographic technology, applied in optics, electrography, instruments, etc., can solve problems such as poor dispersion, large particle cohesion, and stability problems, and achieve long-term stable dispersion and excellent wear resistance.

Inactive Publication Date: 2015-06-10
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Tetrafluoroethylene resin particles have an excellent lubricating function as a material, but on the other hand, there are disadvantages that the cohesion of the particles is very large and the dispersibility is extremely poor due to the non-polarity
Therefore, when dispersing tetrafluoroethylene resin fine particles in the surface layer of the photoreceptor, it is necessary to use a dispersion aid (for example, Patent Document 3), resulting in deterioration of the electrical characteristics of the photoreceptor.
In addition, when dispersing tetrafluoroethylene resin fine particles using a general-purpose resin for photoreceptors (such as polycarbonate resin), aggregates of 1 μm or less temporarily occupy the majority and disperse (Patent Document 4), but there is a problem with its stability over time.

Method used

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  • Coating solution for forming charge transport layer, electrophotographic photoreceptor prepared therewith and image forming apparatus comprising the same
  • Coating solution for forming charge transport layer, electrophotographic photoreceptor prepared therewith and image forming apparatus comprising the same
  • Coating solution for forming charge transport layer, electrophotographic photoreceptor prepared therewith and image forming apparatus comprising the same

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Experimental program
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Embodiment approach 1

[0096] figure 1 It is a schematic diagram showing the cross-section of the electrophotographic photoreceptor according to the present embodiment. The electrophotographic photoreceptor 1 according to this embodiment has a cylindrical conductive substrate 11 containing a conductive material, an undercoat layer (intermediate layer) 15 formed on the outer peripheral surface of the conductive substrate 11 , and The photosensitive layer 14 formed on the surface.

[0097] Such as figure 1 As shown, the photosensitive layer 14 has a charge generation layer 12 and a charge transport layer 13 . The charge generating layer 12 is laminated on the outer peripheral surface of the undercoat layer 15 and contains a charge generating substance. The charge transport layer 13 is laminated on the outer peripheral surface of the charge generation layer 12 and contains a charge transport substance.

[0098] figure 1 In the example of , the charge transport layer 13 among the layers constitutin...

Embodiment approach 2

[0195] In Embodiment 1 above, the form in which the photosensitive layer 14 is composed of the charge generating layer 12 and the charge transporting layer 13 has been described. However, as figure 2 Like the photoreceptor 1 shown, the photosensitive layer 14 may also be formed of a single layer. That is, it may be formed of a cylindrical conductive substrate 11 containing a conductive material and a photosensitive layer 14 containing a charge generating substance and a charge transporting substance as a layer stacked on the outer peripheral surface of the conductive substrate 11 . In this case, a charge generating substance may be added and dispersed in the coating liquid for forming a charge transport layer of the present invention to prepare a coating liquid for a single-layer photosensitive layer.

[0196] figure 2 In the configuration of , the entire photosensitive layer 14 is the surface layer of the photoreceptor 1 , and the above-mentioned tetrafluoroethylene resin ...

Embodiment approach 3

[0198] Additionally, if image 3 As shown, a multilayer charge transport layer can be formed. image 3 The photoreceptor 1 includes a conductive substrate 11 and a photosensitive layer 14 formed on the outer peripheral surface of the conductive substrate 11 . The photosensitive layer 14 is provided with the charge generation layer 12 formed on the outer peripheral surface of the conductive substrate 11, the first charge transport layer 13A formed on the outer peripheral surface of the charge generation layer 12, and the first charge transport layer 13A formed on the outer peripheral surface of the first charge transport layer 13A. The second charge transport layer 13B. for image 3 The photoreceptor 1 is formed so that the content of the charge transport substance in the first charge transport layer 13A is different from the content in the second charge transport layer 13B. Additionally, for image 3 In terms of the structure, among the layers constituting the photosensiti...

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Abstract

The present invention provides a coating solution for forming a charge transport layer including a charge transport material, a binder resin and tetrafluoroethylene resin fine particles, wherein the binder resin exhibits a surface free energy of 25 to 35 mJ / mm2 in the charge transport layer formed with a coating solution for forming a charge transport layer without comprising the tetrafluoroethylene resin fine particles; and the tetrafluoroethylene resin fine particles (1) include primary particles having an average particle diameter of 0.1 to 0.5 μm and secondary particles corresponding to aggregates of the primary particles; (2) account for 1 to 30% by weight of non-solvent components in the coating solution; (3) contain primary particles and secondary particles having a particle diameter of less than 1 μm at a content of less than 80% by weight; and (4) contain secondary particles having a particle diameter of 3 μm or more at a content of no more than 5% by weight.

Description

technical field [0001] The present invention relates to a coating liquid for forming a charge transport layer, an electrophotographic photoreceptor produced using the coating liquid, and an image forming apparatus including the photoreceptor. More specifically, the present invention relates to a stably dispersed charge transporting layer-forming coating containing a binder resin exhibiting a specific surface free energy after heating, drying and curing, and a stable dispersion containing tetrafluoroethylene resin particles having a specific particle diameter. liquid, a charge transporting layer produced using the coating liquid for forming a charge transporting layer, an electrophotographic photoreceptor comprising a charge generating layer containing a charge generating substance having a specific crystal form, and an electrophotographic image provided with the electrophotographic photoreceptor Forming device (also referred to as "image forming device"). Background techniqu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G5/047G03G5/05
CPCG03G5/0539G03G5/0596G03G5/0696G03G5/14726
Inventor 福岛功太郎马场公希金泽朋子仓内敬广
Owner SHARP KK
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